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x86: Flush TLB if PGD entry is changed in i386 PAE mode

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According to intel CPU manual, every time PGD entry is changed in i386 PAE
mode, we need do a full TLB flush. Current code follows this and there is
comment for this too in the code.

But current code misses the multi-threaded case. A changed page table
might be used by several CPUs, every such CPU should flush TLB. Usually
this isn't a problem, because we prepopulate all PGD entries at process
fork. But when the process does munmap and follows new mmap, this issue
will be triggered.

When it happens, some CPUs keep doing page faults:

  http://marc.info/?l=linux-kernel&m=129915020508238&w=2

Reported-by: Yasunori Goto<y-goto@jp.fujitsu.com>
Tested-by: Yasunori Goto<y-goto@jp.fujitsu.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Shaohua Li<shaohua.li@intel.com>
Cc: Mallick Asit K <asit.k.mallick@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm <linux-mm@kvack.org>
Cc: stable <stable@kernel.org>
LKML-Reference: <1300246649.2337.95.camel@sli10-conroe>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Shaohua Li 2011-03-16 11:37:29 +08:00 committed by Ingo Molnar
parent e8e999cf3c
commit 4981d01ead
2 changed files with 4 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/x86/include/asm/pgtable-3level.h
View File

@ -69,8 +69,6 @@ static inline void native_pmd_clear(pmd_t *pmd)
static inline void pud_clear(pud_t *pudp)
{
unsigned long pgd;
set_pud(pudp, __pud(0));
/*
@ -79,13 +77,10 @@ static inline void pud_clear(pud_t *pudp)
* section 8.1: in PAE mode we explicitly have to flush the
* TLB via cr3 if the top-level pgd is changed...
*
* Make sure the pud entry we're updating is within the
* current pgd to avoid unnecessary TLB flushes.
* Currently all places where pud_clear() is called either have
* flush_tlb_mm() followed or don't need TLB flush (x86_64 code or
* pud_clear_bad()), so we don't need TLB flush here.
*/
pgd = read_cr3();
if (__pa(pudp) >= pgd && __pa(pudp) <
(pgd + sizeof(pgd_t)*PTRS_PER_PGD))
write_cr3(pgd);
}
#ifdef CONFIG_SMP

3
arch/x86/mm/pgtable.c
View File

@ -168,8 +168,7 @@ void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
* section 8.1: in PAE mode we explicitly have to flush the
* TLB via cr3 if the top-level pgd is changed...
*/
if (mm == current->active_mm)
write_cr3(read_cr3());
flush_tlb_mm(mm);
}
#else /* !CONFIG_X86_PAE */